Mitigating PDN-induced radio frequency interference using stepped impedance filters

• Main Authors: PANDIT VINITA, VAHRA YANIV
• Format: Patent
• Language: Chinese; English
• Published: 24.06.2022
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

In some embodiments, an electronic system includes a PDN voltage regulator circuit configured to generate a power supply signal, a printed circuit board (PCB) including a power rail that delivers the power supply signal to a digital circuit that generates an interfering signal. The PDN radiating interference signals or harmonics thereof affects the functionality of the target antenna and circuit (e.g., Wi-Fi, Bluetooth, cellular, etc.). The system includes a filter element configured to filter an interfering signal generated by the digital circuit. The filter element includes a first set of low impedance (low-Z) segments and a second set of high impedance (high-Z) segments. The low-Z segments and the high-Z segments are formed using copper traces of the power rail and connected in series with each other. And the filtering element forms a low-pass filter and filters high-frequency interference information reaching the target antenna and circuit through the radiation device. 在一些实施方式中，电子系统包括配置为产生电源信号的PDN电压调节器电路、